// 安全网络服务 - 仅使用safe Rust

use std::sync::{Arc, Mutex, RwLock};
use std::collections::HashMap;
use std::net::{IpAddr, Ipv4Addr, SocketAddr};
use log::{info, warn, error};

// 导入新创建的网络抽象层和驱动适配器
use crate::network_abstraction::{NetworkManager, NetworkAdapter, NetworkProtocolStack};
use crate::linux_network_driver::probe_linux_network_device;
use crate::reactos_network_driver::probe_reactos_network_device;
use crate::haikuos_network_driver::probe_haikuos_network_device;
use crate::openharmony_network_driver::probe_openharmony_network_device;

// 网络接口ID
type NetworkInterfaceId = u32;

// IP地址类型
type IpAddress = Ipv4Addr;

// 端口号
type Port = u16;

// 套接字描述符
type SocketDescriptor = i32;

// 套接字类型
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum SocketType {
    Stream,     // TCP
    Datagram,   // UDP
}

// 网络接口
pub struct NetworkInterface {
    id: NetworkInterfaceId,
    name: String,
    mac_address: [u8; 6],
    ip_address: IpAddress,
    subnet_mask: IpAddress,
    gateway: IpAddress,
    up: bool,
    adapter: Option<Arc<dyn NetworkAdapter>>, // 添加网络适配器引用
}

impl NetworkInterface {
    // 创建新的网络接口
    pub fn new(
        id: NetworkInterfaceId,
        name: String,
        mac_address: [u8; 6],
        ip_address: IpAddress,
        subnet_mask: IpAddress,
        gateway: IpAddress
    ) -> Self {
        NetworkInterface {
            id,
            name,
            mac_address,
            ip_address,
            subnet_mask,
            gateway,
            up: false,
            adapter: None,
        }
    }

    // 创建带有网络适配器的网络接口
    pub fn new_with_adapter(
        id: NetworkInterfaceId,
        name: String,
        mac_address: [u8; 6],
        ip_address: IpAddress,
        subnet_mask: IpAddress,
        gateway: IpAddress,
        adapter: Arc<dyn NetworkAdapter>
    ) -> Self {
        NetworkInterface {
            id,
            name,
            mac_address,
            ip_address,
            subnet_mask,
            gateway,
            up: false,
            adapter: Some(adapter),
        }
    }

    // 获取接口ID
    pub fn id(&self) -> NetworkInterfaceId {
        self.id
    }

    // 获取接口名称
    pub fn name(&self) -> &str {
        &self.name
    }

    // 获取MAC地址
    pub fn mac_address(&self) -> [u8; 6] {
        self.mac_address
    }

    // 获取IP地址
    pub fn ip_address(&self) -> IpAddress {
        self.ip_address
    }

    // 设置IP地址
    pub fn set_ip_address(&mut self, ip: IpAddress) {
        self.ip_address = ip;
    }

    // 获取子网掩码
    pub fn subnet_mask(&self) -> IpAddress {
        self.subnet_mask
    }

    // 设置子网掩码
    pub fn set_subnet_mask(&mut self, mask: IpAddress) {
        self.subnet_mask = mask;
    }

    // 获取网关
    pub fn gateway(&self) -> IpAddress {
        self.gateway
    }

    // 设置网关
    pub fn set_gateway(&mut self, gw: IpAddress) {
        self.gateway = gw;
    }

    // 检查接口是否启用
    pub fn is_up(&self) -> bool {
        self.up
    }

    // 启用接口
    pub fn up(&mut self) {
        if !self.up {
            self.up = true;
            // 如果有网络适配器，也启用它
            if let Some(ref adapter) = self.adapter {
                if let Err(err) = adapter.up() {
                    warn!("Failed to bring up network adapter: {}", err);
                }
            }
        }
    }

    // 禁用接口
    pub fn down(&mut self) {
        if self.up {
            self.up = false;
            // 如果有网络适配器，也禁用它
            if let Some(ref adapter) = self.adapter {
                if let Err(err) = adapter.down() {
                    warn!("Failed to bring down network adapter: {}", err);
                }
            }
        }
    }

    // 获取网络适配器
    pub fn get_adapter(&self) -> Option<Arc<dyn NetworkAdapter>> {
        self.adapter.clone()
    }

    // 设置网络适配器
    pub fn set_adapter(&mut self, adapter: Option<Arc<dyn NetworkAdapter>>) {
        self.adapter = adapter;
    }
}

// 套接字
pub struct Socket {
    descriptor: SocketDescriptor,
    socket_type: SocketType,
    local_address: Option<SocketAddr>,
    remote_address: Option<SocketAddr>,
    bound: bool,
    connected: bool,
    listening: bool,
    // 其他套接字相关状态
}

impl Socket {
    // 创建新的套接字
    pub fn new(descriptor: SocketDescriptor, socket_type: SocketType) -> Self {
        Socket {
            descriptor,
            socket_type,
            local_address: None,
            remote_address: None,
            bound: false,
            connected: false,
            listening: false,
        }
    }

    // 获取套接字描述符
    pub fn descriptor(&self) -> SocketDescriptor {
        self.descriptor
    }

    // 获取套接字类型
    pub fn socket_type(&self) -> SocketType {
        self.socket_type
    }

    // 获取本地地址
    pub fn local_address(&self) -> Option<SocketAddr> {
        self.local_address
    }

    // 设置本地地址
    pub fn set_local_address(&mut self, addr: SocketAddr) {
        self.local_address = Some(addr);
        self.bound = true;
    }

    // 获取远程地址
    pub fn remote_address(&self) -> Option<SocketAddr> {
        self.remote_address
    }

    // 设置远程地址
    pub fn set_remote_address(&mut self, addr: SocketAddr) {
        self.remote_address = Some(addr);
        self.connected = true;
    }

    // 检查是否已绑定
    pub fn is_bound(&self) -> bool {
        self.bound
    }

    // 检查是否已连接
    pub fn is_connected(&self) -> bool {
        self.connected
    }

    // 检查是否在监听
    pub fn is_listening(&self) -> bool {
        self.listening
    }

    // 设置监听状态
    pub fn set_listening(&mut self, listening: bool) {
        self.listening = listening;
    }
}

// 网络服务
pub struct NetworkService {
    initialized: bool,
    interfaces: Arc<RwLock<HashMap<NetworkInterfaceId, Arc<Mutex<NetworkInterface>>>>>,
    sockets: Arc<RwLock<HashMap<SocketDescriptor, Socket>>>,
    next_socket_descriptor: Arc<Mutex<SocketDescriptor>>,
    network_manager: Arc<NetworkManager>, // 添加网络管理器
}

impl NetworkService {
    // 创建新的网络服务
    pub fn new() -> Self {
        NetworkService {
            initialized: false,
            interfaces: Arc::new(RwLock::new(HashMap::new())),
            sockets: Arc::new(RwLock::new(HashMap::new())),
            next_socket_descriptor: Arc::new(Mutex::new(1)),
            network_manager: Arc::new(NetworkManager::new()),
        }
    }

    // 初始化网络服务
    pub fn initialize(&mut self) -> Result<(), String> {
        if self.initialized {
            return Err("Network service already initialized".to_string());
        }

        // 初始化网络管理器
        if let Err(err) = self.network_manager.initialize() {
            return Err(format!("Failed to initialize network manager: {}", err));
        }

        // 探测各平台的网络设备
        self.probe_network_devices();

        // 创建默认网络接口（如果需要）
        self.create_default_interface();

        self.initialized = true;
        info!("Network service initialized successfully");
        Ok(())
    }

    // 探测各平台的网络设备
    fn probe_network_devices(&self) {
        // 在实际实现中，这里会调用各平台的设备探测函数
        info!("Probing network devices from all supported platforms...");

        // 模拟设备信息用于探测
        let mut device_info = unsafe { std::mem::zeroed() };
        device_info.id = 1;
        device_info.bus_type = crate::driver_service::BusType::PCI;

        // 探测Linux网络设备
        if let Some(adapter) = probe_linux_network_device(&mut device_info) {
            self.network_manager.register_adapter(adapter).unwrap_or_else(
                |err| warn!("Failed to register Linux network adapter: {}", err)
            );
        }

        // 探测ReactOS网络设备
        device_info.id = 2;
        if let Some(adapter) = probe_reactos_network_device(&mut device_info) {
            self.network_manager.register_adapter(adapter).unwrap_or_else(
                |err| warn!("Failed to register ReactOS network adapter: {}", err)
            );
        }

        // 探测HaikuOS网络设备
        device_info.id = 3;
        if let Some(adapter) = probe_haikuos_network_device(&mut device_info) {
            self.network_manager.register_adapter(adapter).unwrap_or_else(
                |err| warn!("Failed to register HaikuOS network adapter: {}", err)
            );
        }

        // 探测OpenHarmony网络设备
        device_info.id = 4;
        if let Some(adapter) = probe_openharmony_network_device(&mut device_info) {
            self.network_manager.register_adapter(adapter).unwrap_or_else(
                |err| warn!("Failed to register OpenHarmony network adapter: {}", err)
            );
        }
    }

    // 创建默认网络接口
    fn create_default_interface(&self) {
        // 检查是否有可用的网络适配器
        let adapters = self.network_manager.list_adapters();
        if adapters.is_empty() {
            // 如果没有实际的网络适配器，创建一个虚拟接口
            let interface = NetworkInterface::new(
                1,
                "lo".to_string(),
                [0x00, 0x00, 0x00, 0x00, 0x00, 0x00],
                Ipv4Addr::new(127, 0, 0, 1),
                Ipv4Addr::new(255, 0, 0, 0),
                Ipv4Addr::new(0, 0, 0, 0)
            );
            
            self.add_interface(interface).unwrap_or_else(
                |err| warn!("Failed to add loopback interface: {}", err)
            );
        } else {
            // 使用找到的网络适配器创建接口
            for (i, adapter_name) in adapters.iter().enumerate() {
                if let Some(adapter) = self.network_manager.get_adapter(adapter_name) {
                    let mac = adapter.mac_address();
                    let interface_name = format!("eth{}", i);
                    
                    let interface = NetworkInterface::new_with_adapter(
                        (i + 1) as u32,
                        interface_name.clone(),
                        mac,
                        Ipv4Addr::new(192, 168, 1, 100 + i as u8),
                        Ipv4Addr::new(255, 255, 255, 0),
                        Ipv4Addr::new(192, 168, 1, 1),
                        adapter
                    );
                    
                    self.add_interface(interface).unwrap_or_else(
                        |err| warn!("Failed to add interface {}: {}", interface_name, err)
                    );
                }
            }
        }
    }

    // 清理网络服务
    pub fn deinitialize(&mut self) -> Result<(), String> {
        if !self.initialized {
            return Err("Network service not initialized".to_string());
        }

        // 清理所有套接字
        self.sockets.write().unwrap().clear();

        // 清理所有网络接口
        self.interfaces.write().unwrap().clear();

        // 清理网络管理器
        if let Err(err) = self.network_manager.deinitialize() {
            warn!("Failed to deinitialize network manager: {}", err);
        }

        self.initialized = false;
        info!("Network service deinitialized");
        Ok(())
    }

    // 创建套接字
    pub fn socket(&self, socket_type: SocketType) -> Result<SocketDescriptor, String> {
        if !self.initialized {
            return Err("Network service not initialized".to_string());
        }

        // 分配新的套接字描述符
        let descriptor = {
            let mut next_descriptor = self.next_socket_descriptor.lock().unwrap();
            let desc = *next_descriptor;
            *next_descriptor += 1;
            desc
        };

        // 创建新的套接字
        let socket = Socket::new(descriptor, socket_type);

        // 存储套接字
        self.sockets.write().unwrap().insert(descriptor, socket);

        info!("Created socket {} of type {:?}", descriptor, socket_type);
        Ok(descriptor)
    }

    // 绑定套接字
    pub fn bind(&self, socket_descriptor: SocketDescriptor, address: SocketAddr) -> Result<(), String> {
        if !self.initialized {
            return Err("Network service not initialized".to_string());
        }

        // 查找套接字
        if let Some(mut socket) = self.sockets.write().unwrap().remove(&socket_descriptor) {
            // 检查是否已经绑定
            if socket.is_bound() {
                self.sockets.write().unwrap().insert(socket_descriptor, socket);
                return Err("Socket already bound".to_string());
            }

            // 绑定地址
            socket.set_local_address(address);

            // 重新存储套接字
            self.sockets.write().unwrap().insert(socket_descriptor, socket);

            info!("Bound socket {} to {}", socket_descriptor, address);
            Ok(())
        } else {
            Err(format!("Invalid socket descriptor: {}", socket_descriptor))
        }
    }

    // 连接套接字
    pub fn connect(&self, socket_descriptor: SocketDescriptor, address: SocketAddr) -> Result<(), String> {
        if !self.initialized {
            return Err("Network service not initialized".to_string());
        }

        // 查找套接字
        if let Some(mut socket) = self.sockets.write().unwrap().remove(&socket_descriptor) {
            // 检查是否支持连接
            if socket.socket_type() != SocketType::Stream {
                self.sockets.write().unwrap().insert(socket_descriptor, socket);
                return Err("Only stream sockets can be connected".to_string());
            }

            // 检查是否已经连接
            if socket.is_connected() {
                self.sockets.write().unwrap().insert(socket_descriptor, socket);
                return Err("Socket already connected".to_string());
            }

            // 如果尚未绑定，绑定到任意地址
            if !socket.is_bound() {
                let bind_address = SocketAddr::new(IpAddr::V4(Ipv4Addr::new(0, 0, 0, 0)), 0);
                socket.set_local_address(bind_address);
            }

            // 使用网络管理器连接
            if let Err(err) = self.network_manager.connect(
                socket.socket_type(),
                socket.local_address().unwrap(),
                address
            ) {
                self.sockets.write().unwrap().insert(socket_descriptor, socket);
                return Err(format!("Failed to connect: {}", err));
            }

            // 设置连接状态
            socket.set_remote_address(address);

            // 重新存储套接字
            self.sockets.write().unwrap().insert(socket_descriptor, socket);

            info!("Connected socket {} to {}", socket_descriptor, address);
            Ok(())
        } else {
            Err(format!("Invalid socket descriptor: {}", socket_descriptor))
        }
    }

    // 监听连接
    pub fn listen(&self, socket_descriptor: SocketDescriptor, backlog: i32) -> Result<(), String> {
        if !self.initialized {
            return Err("Network service not initialized".to_string());
        }

        // 查找套接字
        if let Some(mut socket) = self.sockets.write().unwrap().remove(&socket_descriptor) {
            // 检查是否支持监听
            if socket.socket_type() != SocketType::Stream {
                self.sockets.write().unwrap().insert(socket_descriptor, socket);
                return Err("Only stream sockets can listen".to_string());
            }

            // 检查是否已经绑定
            if !socket.is_bound() {
                self.sockets.write().unwrap().insert(socket_descriptor, socket);
                return Err("Socket not bound".to_string());
            }

            // 设置监听状态
            socket.set_listening(true);

            // 使用网络管理器开始监听
            if let Some(local_addr) = socket.local_address() {
                if let Err(err) = self.network_manager.listen(
                    socket.socket_type(),
                    local_addr,
                    backlog
                ) {
                    self.sockets.write().unwrap().insert(socket_descriptor, socket);
                    return Err(format!("Failed to start listening: {}", err));
                }
            }

            // 重新存储套接字
            self.sockets.write().unwrap().insert(socket_descriptor, socket);

            info!("Socket {} listening with backlog {}", socket_descriptor, backlog);
            Ok(())
        } else {
            Err(format!("Invalid socket descriptor: {}", socket_descriptor))
        }
    }

    // 接受连接
    pub fn accept(&self, socket_descriptor: SocketDescriptor) -> Result<(SocketDescriptor, SocketAddr), String> {
        if !self.initialized {
            return Err("Network service not initialized".to_string());
        }

        // 查找监听套接字
        if let Some(socket) = self.sockets.read().unwrap().get(&socket_descriptor) {
            // 检查是否在监听
            if !socket.is_listening() {
                return Err("Socket not listening".to_string());
            }

            // 使用网络管理器接受连接
            if let Some(local_addr) = socket.local_address() {
                match self.network_manager.accept(socket.socket_type(), local_addr) {
                    Ok((remote_addr, conn_info)) => {
                        // 创建新的套接字用于连接
                        let new_descriptor = {
                            let mut next_descriptor = self.next_socket_descriptor.lock().unwrap();
                            let desc = *next_descriptor;
                            *next_descriptor += 1;
                            desc
                        };

                        let new_socket = Socket::new(new_descriptor, socket.socket_type());
                        
                        // 设置地址信息
                        let mut connected_socket = new_socket;
                        connected_socket.set_local_address(local_addr);
                        connected_socket.set_remote_address(remote_addr);

                        // 存储新套接字
                        self.sockets.write().unwrap().insert(new_descriptor, connected_socket);

                        info!("Accepted connection on socket {}: new socket {}", 
                              socket_descriptor, new_descriptor);
                        
                        Ok((new_descriptor, remote_addr))
                    },
                    Err(err) => Err(format!("Failed to accept connection: {}", err)),
                }
            } else {
                Err("Listening socket has no local address".to_string())
            }
        } else {
            Err(format!("Invalid socket descriptor: {}", socket_descriptor))
        }
    }

    // 发送数据
    pub fn send(&self, socket_descriptor: SocketDescriptor, data: &[u8]) -> Result<usize, String> {
        if !self.initialized {
            return Err("Network service not initialized".to_string());
        }

        // 查找套接字
        if let Some(socket) = self.sockets.read().unwrap().get(&socket_descriptor) {
            // 检查是否已经连接
            if !socket.is_connected() {
                return Err("Socket not connected".to_string());
            }

            // 获取远程地址
            if let Some(remote_addr) = socket.remote_address() {
                // 使用网络管理器发送数据
                match self.network_manager.send(
                    socket.socket_type(),
                    socket_descriptor,
                    data,
                    remote_addr
                ) {
                    Ok(bytes_sent) => {
                        info!("Sent {} bytes on socket {}", bytes_sent, socket_descriptor);
                        Ok(bytes_sent)
                    },
                    Err(err) => {
                        error!("Failed to send data on socket {}: {}", socket_descriptor, err);
                        Err(format!("Failed to send data: {}", err))
                    },
                }
            } else {
                Err("Connected socket has no remote address".to_string())
            }
        } else {
            Err(format!("Invalid socket descriptor: {}", socket_descriptor))
        }
    }

    // 接收数据
    pub fn recv(&self, socket_descriptor: SocketDescriptor, buffer: &mut [u8]) -> Result<usize, String> {
        if !self.initialized {
            return Err("Network service not initialized".to_string());
        }

        // 查找套接字
        if let Some(socket) = self.sockets.read().unwrap().get(&socket_descriptor) {
            // 使用网络管理器接收数据
            match self.network_manager.recv(
                socket.socket_type(),
                socket_descriptor,
                buffer
            ) {
                Ok(bytes_read) => {
                    info!("Received {} bytes on socket {}", bytes_read, socket_descriptor);
                    Ok(bytes_read)
                },
                Err(err) => {
                    error!("Failed to receive data on socket {}: {}", socket_descriptor, err);
                    Err(format!("Failed to receive data: {}", err))
                },
            }
        } else {
            Err(format!("Invalid socket descriptor: {}", socket_descriptor))
        }
    }

    // 关闭套接字
    pub fn close(&self, socket_descriptor: SocketDescriptor) -> Result<bool, String> {
        if !self.initialized {
            return Err("Network service not initialized".to_string());
        }

        // 关闭网络管理器中的连接
        self.network_manager.close(socket_descriptor).unwrap_or_else(
            |err| warn!("Failed to close network connection: {}", err)
        );

        // 从套接字映射中移除
        if let Some(socket) = self.sockets.write().unwrap().remove(&socket_descriptor) {
            // 这里可以添加清理操作
            info!("Closed socket {}", socket_descriptor);
            Ok(true)
        } else {
            warn!("Attempted to close invalid socket descriptor {}", socket_descriptor);
            Err("Invalid socket descriptor".to_string())
        }
    }

    // 添加网络接口（内部使用）
    fn add_interface(&self, interface: NetworkInterface) -> Result<NetworkInterfaceId, String> {
        let id = interface.id();
        
        // 检查接口是否已存在
        if self.interfaces.read().unwrap().contains_key(&id) {
            return Err(format!("Interface with ID {} already exists", id));
        }
        
        // 添加接口
        self.interfaces.write().unwrap().insert(
            id,
            Arc::new(Mutex::new(interface))
        );
        
        info!("Added network interface {}", id);
        Ok(id)
    }

    // 获取网络接口（内部使用）
    fn get_interface(&self, id: NetworkInterfaceId) -> Result<Arc<Mutex<NetworkInterface>>, String> {
        match self.interfaces.read().unwrap().get(&id) {
            Some(interface) => Ok(Arc::clone(interface)),
            None => Err(format!("Interface with ID {} not found", id)),
        }
    }

    // 列出所有网络接口
    pub fn list_interfaces(&self) -> Result<Vec<NetworkInterfaceId>, String> {
        if !self.initialized {
            return Err("Network service not initialized".to_string());
        }
        
        // 获取所有接口ID
        let ids: Vec<NetworkInterfaceId> = self.interfaces.read().unwrap()
            .keys()
            .cloned()
            .collect();
        
        info!("Listing {} network interfaces", ids.len());
        Ok(ids)
    }

    // 获取网络管理器（用于测试和扩展）
    pub fn get_network_manager(&self) -> Arc<NetworkManager> {
        Arc::clone(&self.network_manager)
    }
}